What do you call someone who thinks their opinion is always right?

People who always think they are totally right are either borderline personality disorder, narcissist, or both. It is their ego’s reaction to the fear of being exposed, they can’t even be honest with themselves. Tthey actually believe they are right because they filter the facts that they are willing to perceive.

What is someone who thinks they are better than others?

adjective. someone who is arrogant thinks they are better or more important than other people and behaves in a way that is rude and too confident.

What do you call a person who thinks they deserve everything?

egocentric: This is more like someone who is concerned with getting only what he wants, without regard for anyone else. poise: If she is confident she deserves everything she wants, then she could be said to have a certain poise (there are several words that could work here: stately, reclined, unconcerned).